2.The green square did not show up when you moused over somewhere
3.Moving around was different,when you clicked somewhere,you would move there
4.Combat was different,when clicking on an enemy,icons would appear around the enemy,like in swords and sandals 1 and 2.
5.The game was a little more 2.5d
All of this is from the video of the alpha version that hechaos,a developer of Swords and Sandals posted. The channel was closed however,and the video can't be seen anymore.
Thats all we know right now about what SaS 5 was going to be.